Ground receiving outfit.



C. E. MELLON.

GROUND RECEIVING OUTHT.

APPLICATION FILED AUG. 12. 1913 1,163,839, Patented Dec. 14, 1915.

2 SHEETS-SHEET1,

311 we 11 mm (YE/116M013,

MELLUN.

\mouwo RECEIVING 0mm.

AL-"PLICA L L. I

[ION FILED AUG. 12, 1915 Puicntcd Dec. H, 1915.

ZSHL ETS SHEET 2 UNITED STATES PATENT OFFICE.

CHARLES E. MELLON, OF COATESVILLE, PENNSYLVANIA, ASSIGNOR. BY .MESNE AS-SIGNMENTS, TO SAID MELLON. JOHN H. SMY'IHE, C. EDWARD GILLESPIE, ANDMOBEY A. PAR-K, ALL OF PARKESBURG, PENNSYLVANIA.

GROUND RECEIVING OUTFIT.

Application filed August 12, 1913.

To all ltt/LOHZ [If may concern Be it known that 1, (names E. MELLON, acitizen of the United States, residing at Coatesville, in the county ofChester, State of Pennsylvania, have invented certain new and usefulImprovements in Ground Receiving Outfits; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

This invention relates to wireless telegra phy and has special referenceto the receiving set of a wireless telegraph station.

One object of the invention is to improve thewiring connection orhook-up of the receiving set of such a station so that waves of verywide range and length may be received clearly and distinctly.

A second object of the invention is to provide an improved form of whatis preferably termed a variable resistance device as will be hereinafterdescribed.

A third object of the invention is to provide an improved arrangementwhich will permit of extremely accurate tuning, the arrangement beingsuch as to pick up the over tones of the message to be received so thatselection can be made between the same.

Vltll the abov and other objects in view the invention consists first ofall in a certain novel hook up hereinafter fully described, illustratedin the accompanying drawings, and specifically claimed, and secondconsists in a novel form of what is termed a variable resistance device.

In the accompanying drawings, like characters of reference indicate likeparts in the several views, and Figure 1 is a diagram matic view showingthe novel wiring arrangement. Fig. 2 is a side view of the variableresistance device partly diagrammatic showing the parts in the positionat zero. Fig. 3 is a view similar to- Fig. 2 but showing the parts at90. Fig. 4 is a section on the line 44 of Fig. 2. y

In order to understand the operation of the invention the improvedvariable resistance device will first be described. It consists of apair of hard rubber shells 10 and 11 which are zones of spheres. Theshell 11 is mounted within the shell 10 so that one can rotate withinthe other in order that the Zones may pass through varying Specificationof Letters Patent.

Patented Dec. 14, 1915.

Serial No. 784,420.

angles with respect to each other. On the outside of these shells iswound conducting wire and the wires on the two shells are connected inseries. The wires on these shells are indicated at 12, and 13respectively and are represented in the diagrammatic view as theresistances bearing the same numbers. Now it will be seen that by meansof this construction the current may be caused to flow through onewinding, say 12. in the same direction as through the winding 13, in theopposite direction to said winding, or at any desired angle thereto asmay be required. merely by rotating one shell with respect to the other.There is thus provided a tuning device of extreme delicacy astheinductive relations of the two windings may be varied with absolutedelicacy instead of the stepped result of shifting the contact in thecommon type of tuning coil. The particular means for shifting thewindings with respect to each other is not shown as this may be done inany desired manner from rough hand manipu lation to such complicatedmechanism as may be desired.

V In the receiving set illustrated in Fig. 1 there is provided in theantenna .1 the usual binding post 15 to which is connected by means of awire 16 one end of a load coil of any preferred type. Leading from thisload coil 17 to a series of contacts 18 are the connecting wires 19,these wires being connected to spaced points on the load coil. At 20 isa switch which swings over the circle of the contacts 18 so that theswitch may be brought into connection with any one of the wires 19 andconsequently the length of load coil between the wire 16 and the switch20 is regulated.

From the switch 20 a wire 21 leads to a switch 22 which has connectionby means of a wire 28 with one end of one of the coils of the variableresistance devices 21. The device 21 is also connected, from the othercoil, by means of a wire 25 with the switch 26. From the switch 26 runsawire 27 which leads to a ariable condenser 28 of the rotary type. Fromthis variable condenser a wire 29 leads to an audion 30 of any preferredform. Connected with this audion by means of the wires 31 and 32 are thebattery and the battery rheostat 3%,the same being connected in seriesby means of a wire. 35.

The wire 31 is also connected by means of a wire 36 with a binding post3? from which a wire 38 leads to the ground 39. The audion tll isfurthermore connected by means oi a wire 40 with the battery -l-1 andthis battery is so arranged that each cell thereof is pro vided with awire 42 leading to a respective contact 43 arranged to be engaged by thefree end of a contact arm ll, the latter being connected by means of awire 45 with the ear piece or receiver i6 of a telephone The other earpiece or receiver head set. 47 of this head set is connected by means ofa wire 48 with a wire 49 leading to the binding post 3?. Across thewires 35 and 48 is bridged the variable condenser 50 of the same type ofthe condenser 28.

From the binding post 12 a wire 51 extends to a switch 552 which iscapable of connection through a wire 53 with one end of the variableresistance device 5%, the other end of said device being connected by aWire 55 with a switch 56 which is in turn connected to the wire 49.Across the wires 27 and 49 is bridged the variable condenser 57, thesame being connected to the Wire 27 by means of a wire 58 and to thewire 49 by means of wire 59.

lFhe switches 22 and 26 may be connected, by moving the switchesproperly, to Wires 60 and 61 which lead to the variable resistance 62,the latter being provided With spaced contacts 63'over which a contactarm 64 may swing, this contact arm being connected to the Wire 61. inlike manner the switches 52 and 56 are connected by wires 65 and 66 toanother variable resistance 67 provided with the contact points 68 andcontact arm 69. Each of these variable resistances prefe ably consistsof a hard rubber tube wound with wire, the construction not beingnecessary here to be shown other than diagrammatic. I i

From the foregoing it will be seen that either of the variableresistance devices 24 and may be cut in the line at Will and at the sametime either of the variable resistances (32 and 67 cut out since thecut-ting in of the variable resistance devices 24 and 54 cuts out thevariable resistances 62 and 67. It will be seen that by propermanipulation of the switches and '26 both the variable resistance device2- and variable resistance (32 may be cut out and in like manner properi'nanipulation of the switches 52 and 56 will cut out both the *ariableresistance device 5% and the variable resistance 67.

l or the purpose of illustrating the apparatus the load coil will beassumed to have an inductance of about three thousand microhenrys. Thevariable resistance devices will be supposed to consist of two hardrubber shells one six inches in outside diameter and two and one-halfinches long and the other one live and one-half inches outside diameterand two and one halt inches long. lfiach of these shells has woundthereon a coil of thirty-six turns of number eighteen cabled wire. Thevariable resistances 2 and bi each consists of a hard rubber tube. oneinch in diameter and eight inches long wound with one hundred sixtyturns of number.

eighteen cabled wire. The variable eondensers will each have a capacityof .020 mierofarads. With a set such as this the length of the wavesreceived may vary from one hundred meters to six thousand meters. Forinstance in receiving a low wave s g' nal, say one hundred meters, theload coil switch is connected to the first point of the contact '18 sothat the wires 16 and the switch 20 are connected in series and the loadcoil cut out. Bot-h *ariablc resistances 62 and 67 are cut in and bothvariable resistance devices 24: and 54 are cut out and the center andbottom variable condensers 57 and 50 are set at zero, also the audionand high tension batteries are in circuit. The receiving apparatus maythen be tuned for the ave by properly adjusting the variable condenser57 by trial.

F or receiving a long wave of say three thousand meters length the loadcoal switch -20 is shifted to the last point of the load coil contact 18so as to throw the entire load coil in series. Both the variableresistance devices 24 and 5% are then cut in and set at one hundred andeighty degrees the variable condensers 28 and 50 are set at one hundredand eighty degrees and the variable condenser 57 is set at sixtydegrees. Under these circumstances shifting of either of the condensers57 or 50 slightly will entirely out out the signal after it is oncetuned in by properly adjusting the said condenser. For accurate tuning aslight adjustment in the variable resistance device 54 may be made.Under some conditions two stations are sending at the same time and bothhave substantially the same Wave length. One station may then be causedto produce louder sounds in the ear pieces than the other by slightlyadjusting thevariable resistance device 24:.

As is Well known three different tones can in some systems be recognizedas being sent from a single station. With this instrument one can obtainthe effect of all three of these Wave lengths or tones if desired or anytwo may be cut out.

There has thus been provided a simple and elticient device oi the kinddescribed and of the character specified.

Having thus described the invention, what is claimed as new, is

1. The combination with an aerial; of a plurality of tuning devicesarranged for connection to said aerial, a variable condenser bridgedacross said tuning devices, second variable condenser connected inseries to one of said tuning devices, an audion connected in series tothe second variable condenser, a battery connected in series to theaudion, a receiving telephone, electric connections between saidtelephone and the second tuning device and battery arranged to connectthe second tuning device, the telephone and battery in series, a thirdvariable condenser connected in multiple with said telephone to saidbattery and second tuning device, and a ground connection leading fromthe connection between the telephone and second tuning device.

2. The combination with an aerial; of a plurality of tuning devicesarranged for connection to said aerial, a variable condenser bridgedacross said tuning devices, a second variable condenser connected in series to one of said tuning devices, an audion connected in series tothesecond variable condenser, a battery connected in series to the audion,a receiving telephone, electric connections between said telephone andthe second tuning device and battery arranged to connect the secondtuning device, the telephone and battery in series, a third variablecondenser connected in multiple with said telephone to said battery andsecond tuning device, a ground connection leading from the connectionbetween the telephont vand second tuning device, a second battery, arheostat connected in series to the second battery, connections betweenthe rheostat and second battery and the audion,-

and a ground connection leading from the connection between the secondbattery and audion.

3. The combination with an aerial; of a plurality of tuning devicesarranged for connection to said aerial, a variable condenser bridgedacross said tuning devices, a second variable condenser connected inseries to one of said tuning devices, an audion connected in series tothe second variable condenser, a battery connected in series to theaudion, a receiving telephone, electric connections between saidtelephone and the second tuning de ice and battery arranged to connectthe second tuning device, the telephone and battery in series, a thirdvariable condenser connected in multiple with said telephone to saidbattery and second tuning device, a ground connection leading from theconnection between the telephone and second tuning device, a secondbattery, a rheostat connected in series to the second battery,connections between the rheostat and second battery and the audion, anda ground connection leading from the connection between the secondbattery and audion, and a load coil arranged to be cut in between theaerial and first tuning device.

4. The combination with an aerial; of a plurality of sets of tuningdevices each consisting of a variable resistance and variable resistancedevice, means for selectively connecting an instrument of each set tothe aerial, a variablecondenser bridged across said tuning devices, asecond variable condenser connected in series to one of said tuningdevices, an audion connected in series to the second variable condenser,a battery con nected in series to the audion, a receiving telephone,electric connections between said telephone and the second timing deviceand battery arranged to connect the second tuning device, the telephoneand battery in series, a third variable condenser connected in multiplewith said telephone to said batteryand second tuning device, and aground connection leading from the connection between the telephone andsecond tuning device.

In testimony whereof, I aflix my signature, in the presence of twoWitnesses.

CHARLES E. MELLON. Vitnesses:

MOREY A. PARK, C. Enw. GILLEsPIn.

